build: bump libfuzzer-sys from 0.4.3 to 0.4.4 in /fuzz

Bumps [libfuzzer-sys](https://github.com/rust-fuzz/libfuzzer) from 0.4.3 to 0.4.4.
- [Release notes](https://github.com/rust-fuzz/libfuzzer/releases)
- [Changelog](https://github.com/rust-fuzz/libfuzzer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-fuzz/libfuzzer/compare/0.4.3...0.4.4)

---
updated-dependencies:
- dependency-name: libfuzzer-sys
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

fuzz/Cargo.toml

@@ -13,7 +13,7 @@ block_util = { path = "../block_util" }
 devices = { path = "../devices" }
 epoll = "4.3.1"
 libc = "0.2.132"
-libfuzzer-sys = "0.4.3"
+libfuzzer-sys = "0.4.4"
 micro_http = { git = "https://github.com/firecracker-microvm/micro-http", branch = "main" }
 once_cell = "1.13.1"
 qcow = { path = "../qcow" }